body {
    font-weight: 400;
}

.intro-2 {
    background: url("https://upload-images.jianshu.io/upload_images/3424642-fde5831fd635cccf.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240")no-repeat center center;
    background-size: cover;
}

h6 {
    line-height: 1.7;
}